<template>
    <div id="root">
        <div class="todo-container">
            <div class="todo-wrap">
                <MyHeader @addTodo="addTodo"></MyHeader>
                <MyList :todos="todos"></MyList>
                <MyFooter :todos="todos" @checkAllTodo="checkAllTodo" @clearAllTodo="clearAllTodo"></MyFooter>
            </div>
        </div>
    </div>

</template>
<script>

    // 引入组件
    import MyHeader from './components/MyHeader.vue';
    import MyList from './components/MyList.vue';
    import MyFooter from './components/MyFooter.vue';
    export default {
        name:'App',
        components:{MyHeader,MyList,MyFooter},
        data(){
            return {
                todos: JSON.parse(localStorage.getItem('todos')) || []
            }
        },
        methods:{
            // 添加一个Todo
            addTodo(todoObj){
                console.log(todoObj)
                this.todos.unshift(todoObj)
            },
            // 勾选或取消勾选Todo
            checkTodo(id){
                this.todos.forEach((todo)=>{
                    if(todo.id === id) todo.done = !todo.done
                })
            },
            // 删除Todo
            deleteTodo(id){
                this.todos = this.todos.filter((todo) => todo.id !== id)
            },
            // 全选或取消全选
            checkAllTodo(value){
                this.todos.forEach((todo) => {
                    todo.done = value
                });
            },
            // 清除已完成的Todo
            clearAllTodo(){
                this.todos = this.todos.filter((todo) => {
                    return !todo.done
                })
            }
        },
        watch:{
            todos:{
                handler(value){
                    localStorage.setItem('todos',JSON.stringify(value))
                }
            }
        },
        mounted(){
            this.$bus.$on('checkTodo',this.checkTodo);
            this.$bus.$on('deleteTodo',this.deleteTodo);
        },
        beforeDestroy(){
            this.$bus.$off('checkTodo')
            this.$bus.$off('deleteTodo')
        }
    }
</script>
<style>
    /*base*/
    body {
    background: #fff;
    }

    .btn {
    display: inline-block;
    padding: 4px 12px;
    margin-bottom: 0;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
    border-radius: 4px;
    }

    .btn-danger {
    color: #fff;
    background-color: #da4f49;
    border: 1px solid #bd362f;
    }

    .btn-danger:hover {
    color: #fff;
    background-color: #bd362f;
    }

    .btn:focus {
    outline: none;
    }

    .todo-container {
    width: 600px;
    margin: 0 auto;
    }
    .todo-container .todo-wrap {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    }

</style>